Non-destructive testing - Measurement and evaluation of the X-ray tube voltage - Part 1: Voltage divider method; German version EN 12544-1:1999— 4 стр.
Non-destructive testing - Radioscopic testing - Part 3: General principles for the radioscopic testing of metallic materials by X- and gamma rays; German version EN 13068-3:2001— 13 стр.